WRF模式不同云微物理參數(shù)化方案對(duì)東亞夏季風(fēng)模擬影響的研究

doi:10.3969/2015jms.0058

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WRF模式不同云微物理參數(shù)化方案對(duì)東亞夏季風(fēng)模擬影響的研究
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                        10.3969/2015jms.0058
                    
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基金項(xiàng)目:國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃（973計(jì)劃）項(xiàng)目（2010CB428505）；國(guó)家自然科學(xué)基金項(xiàng)目（41275012，41475069）

Impact of different microphysics schemes on monsoonal climate simulation in East Asia

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摘要:

利用WRF v3.2.1模式，采用其中5種云微物理參數(shù)化方案對(duì)2007-2011年的東亞夏季風(fēng)氣候進(jìn)行了模擬研究，結(jié)果顯示：5種方案均能較好地模擬出我國(guó)東部地區(qū)夏季降水的基本分布，但各方案對(duì)降水中心強(qiáng)度及其分布的模擬仍然存在明顯的差異，總體來(lái)看，WDM6方案模擬的東亞夏季降水強(qiáng)度明顯比其他4種方案大，而Morrison方案對(duì)降水的模擬總體效果好于其他4種方案。從云微物理角度來(lái)看，5種云微物理參數(shù)化方案均能比較合理地描述云水、雨水及冰相粒子的空間分布狀態(tài)。其中，WSM3方案計(jì)算的云水、雨水質(zhì)量混合比明顯比其它方案大，WDM6方案計(jì)算的云水質(zhì)量混合比則較小，而Morrison方案計(jì)算的雨水質(zhì)量混合比較小，再者該方案冷云中霰粒子濃度偏小，因而Morrison方案在粵閩兩省的夏季日降水量模擬比其他方案小，從而與TRMM觀測(cè)結(jié)果更為接近。采用5種云微物理參數(shù)化方案均能較好地模擬出春、夏季西太平洋副高、雨帶和大氣水凝物在東亞地區(qū)的季節(jié)進(jìn)退過(guò)程。5種方案模擬的雨水粒子濃度分布和中緯度雨帶在南北進(jìn)退過(guò)程中的位置較為吻合，兩者均跟隨西太平洋副高北進(jìn)、南退。對(duì)于中低緯度存在的大降水中心來(lái)說(shuō)，其位置少動(dòng)，并且與該地區(qū)存在的的冰晶、雪晶粒子的高值中心具有較好的對(duì)應(yīng)關(guān)系，說(shuō)明在中低緯度地區(qū)，與熱帶對(duì)流相伴隨的較高層次的冰相粒子數(shù)的濃度是決定降水強(qiáng)弱的關(guān)鍵因素。

Abstract:

By using the mesoscale WRF model version 3.2.1, the simulation effects of five different microphysics schemes on summer monsoonal climate from 2007 to 2011 in East Asia were comparatively analyzed. Results show that each scheme can clarify the distribution of summer daily precipitations in eastern China, however, obvious difference exists in the simulations of summer precipitation intensity and distributions: the summer precipitation intensity by the WDM6 scheme is obviously stronger than other four schemes and the total performance of simulated precipitation by Morrison scheme is better than other schemes. Moreover, five microphysics schemes simulate well the spatial distributions of cloud water, rain and ice-phase particles. The cloud water and rain mixing ratios calculated by WSM3 scheme is clearly larger than other schemes, while the cloud water mixing ratio by WDM6 is smaller compared to other schemes. In addition to the relatively smaller rain mixing ratio by Morrison scheme, the mixing ratio of graupel in cold cloud is also smaller, resulting in the weaker summer daily precipitation between the Guangdong province and the Fujian province than other schemes but more close to the TRMM dataset. What’s more, five microphysics schemes also can describe the seasonal advance and retreat of the sub-tropical high, rain belt and atmospheric hydrometeors over East Asian. Besides, the rain water particles and the rain belts in the latitude of five microphysics schemes are consistent with each other in the process of their advance and retreat, following after the northward advance and the southward retreat of the sub-tropical high. Finally, the abundant precipitations in the low-middle latitude areas, which is little available to move to the other districts, are always consistent with the maximum of the ice and snow particles over these areas, it means that the density of ice-phased particles at high level of atmosphere resulted from the tropical convection is the key factor to determine the strength of precipitations in the low-middle latitude areas.

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陳浩偉,鄭益群,曾新民,艾凱. WRF模式不同云微物理參數(shù)化方案對(duì)東亞夏季風(fēng)模擬影響的研究.氣象科學(xué),2016,36(5):593-605 CHEN Haowei, ZHENG Yiqun, ZENG Xinmin, AI Kai. Impact of different microphysics schemes on monsoonal climate simulation in East Asia. Journal of the Meteorological Sciences,2016,36(5):593-605

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收稿日期:2015-05-15
最后修改日期:2015-07-16
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在線發(fā)布日期: 2016-11-01
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